I am using BES version 4.1.3.18 with Groupwise and I have an issue with one user device. When this user turn off his device or the battery of his device is dead and turn his device ON after couple of hours, the device contact the BES (I saw the last contact) but the messages don't transfer to the device. To resolve this issue, I have to restart the bes and we are fine until the next shutdown of this blackberry.

We are using the same model for everybody and everybody have the same software version.